Modern Herbs of Classic Formulas is a series of traditional Chinese herbal supplements. It combines the ancient art of herbology with the advanced manufacturing techniques. All of the product's formulations are centuries-tested. Only the best herbs are selected and processed in our Good Manufacture Practice (GMP) facilities and under the strictest quality control. Detectable levels of microorganism and heavy metals are all within the safety limits required by regulatory agencies. It is the No. 1 choice by professional practitioners.